I S O L A T E. SB wakes up with a hand big enough to call that then GG me. UTG range with an M of about 3.5 could be just about anything. I push any face card in his spot. Calling here just invites the small blind to come over the top and do what you should have done....isolate. SB would have to have a huge hand to call your over the top and would have much less to come over the top of you if you just call.
I change my answer to this. I really really really really really think that someone in the SB would have to have a pretty small range of hands to risk a lot of chips against an all-in reraiser, with a decent stack.
Just smooth calling w/ 88 is the safer route, and allows you to fold to a reraise, but why allow someone to make you fold your hand? Even if a hand behind you beats you, that's poker. Who knows, someone behind could be making a move w/ AJ-AK, 22-77 to isolate...
Basically, I think that the only hands calling your isolation push here SHOULD be QQ-AA, AK... perhaps 10 10 and JJ.